192 PROCEEDINGS OF THE ACADEMY OP [1886. 



The ventral surface has not been observed, but there is suf- 

 ficient evidence to prove that it was similar to that of the other 

 Fistulata. 



Catillocrinus has its closest affinities with Galceocrinus. The 

 radials of the three anterior rays agree in form and distribution 

 so closel3'^ with the radials of Galceocrinus, that we thoiight at 

 first that it also possessed but three ra3S, and that the two irreg- 

 ular plates toward the posterior side were anals and not radials. 

 This interpretation had to be given up when we found both these 

 plates to be arm-bearing. In Galceocrinus the postero-lateral 

 rays are entirely absent or transformed into anal plates ; while in 

 Gatillocrinus those rays are represented in a rudimentary form. 



The Catillocrinidae are meagre in forms and belong to the rarest 

 Crinoids. The^^ are restricted, so far as known, to the Devonian 

 of Europe and to the Subcarbouiferous of America. 



CATILLOCRINUS Troost. 

 (PI. 5, figs. 15, 15oandl6.) 



1850. Troost, List. Crin. Term. Proc. Amer, Assoc. Ad. Sci., p. 60. 



1830. Sliumard, Trans. Acad. Sci. St. Louis, vol. ii, p. 358. 



1868. Meek aud Wortlien, Geol. Rep. 111., vol. iii, p. 4G5. 



1873. Meek aud Wortheu, Ibid., vol. v, p. 504. 



1879. Zittel, Handb d. Palseontologie, vol. i, p. 348. 



1883. De Loriol, Paleontologie FraiiQaise, Crinoids, vol. xi, p. 46. 



Syn. Nematocrinua Meek and Worthen, 1866, Proc. Acad. Nat. Sci. 

 Phila., p. 251. 



Troost published the name Gatillocrinus in his List of the 

 Crinoids of Tennessee, without generic diagnosis. The first de- 

 scription was given in 1866, by Shumard,.in a foot-note to his 

 Catalogue of the Palaeozoic Fossils of North America, from 

 specimens of Gatillocrinus Tennesseae. He described the calj^x 

 as composed of three series of plates : the "basals " which were 

 said to be covered by the column, and the " primary " and 

 "secondary radials." 



Through the kindness of the late Dr. James Knapp of Louisville 

 we have had an opportunity to examine several well preserved 

 calices of the above species, and can state positively that it has but 

 two series of plates. It seems tbat Shumard took the proximal 

 joint of the column, which is generally attached, for basal plates, 

 and the edges of the basal disk proper for " primary," the true 

 radials for " secondary" radials. 



